For conditional formatting in the Table visualization (perhaps others), when using Greater than or Equal to within the Format by Rules option, the current desktop Power BI version requires an endpoint on the range (either less than, or less than or equal to). This may require the user to enter an arbitrary high number so that all possible values Greater than the the specified value be addressed. In other words, please remove the requirement that the Less Than value be provided when the Greater Than (or Greater Than or Equal To) option is selected for the rule.